I am able to establish IPSEC connection between one client per server. Actually I can connect multi Ipsec server at the same time. But I have realized that when servers have same xl2tpd.conf file like following

Server 1 can be reachable via 192.168.1.1 ip address however
Server 2 can be reachable via different one assigned randomly say 162.xx.xx.xx though in xl2tpd.conf->local ip is set 192.168.1.1.
Actually I am not expecting to reach diffent machines with same ip address.
But how can I make server unique by modifiying the xl2tpd.conf files of all servers.